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Finding the Fourth Proportional to 8,869.20, 11,979.90 and 8,869.20

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Solution

The fourth proportional to 8,869.20, 11,979.90 and 8,869.20 is: 11,979.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,869.20 : 11,979.90 = 8,869.20 : x
  2. Step 2: Convert to fraction form
    8,869.20/11,979.90 = 8,869.20/x
  3. Step 3: Cross multiply
    8,869.20x = 11,979.90 × 8,869.20
  4. Step 4: Simplify right side
    8,869.20x = 106,252,129.08
  5. Step 5: Solve for x
    x = 106,252,129.08/8,869.20
  6. Step 6: Final answer
    x = 11,979.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.